On Fri, Jul 20, 2012 at 10:23 AM, Frederic Bouvier <fredfgf...@free.fr> wrote: > Hi Tim & James, > >> De: "James Turner" >> >> On 20 Jul 2012, at 07:22, Tim Moore wrote: >> >> > We could use the stencil buffer without copying anything: render >> > the near scene first, setting stencil bits, then enable the stencil >> > test for the far scene. I believe that the stencil test has been >> > extremely fast for years. >> >> Oooh, yes - I was forgetting the cameras are rendering to the same >> buffers. >> >> That seems like some low-hanging fruit indeed! > > Rembrandt can't use a scheme where the depth buffer is cleared in between > because it rely on it to compute positions. But it exhibits depth buffer > precision problems too, especially when computing lights (if the light > volume is too tight, it can miss to intersect the terrain). So I was thinking > of playing with depth ranges : the far camera renders with a range > [0.5..1] and then the near camera renders with the range [0..0.5]. I think > this could be unified with the classical renderer. What do you think about > that ? > I would probably give more of the range to the far camera e.g., [0.1..1.0]. This would probably work best with a floating point depth buffer, but if you do that, you might be able to go back to using only one pass.
http://outerra.blogspot.fr/2012/06/couple-of-opengl-notes.html has some interesting insights into the various approaches. Tim > Regards, > -Fred > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
